Leica LS10 - Page 33

Measuring at the upper end of the levelling staff
When measuring at the upper end of the levelling staff, use levelling staffs
with the following lengths:
•
4.05 m
•
2.95 m
•
2.70 m
•
1.95 m
•
1.82 m
With other staff lengths, measurements at the upper end of the staff are not
possible.
Code length required in the eld of view
☞
For exact measurements, the centre area in the eld of view should
be free of any interfering cover.
The following code lengths are required in the eld of view, depending on the
distance to the staff.
Distance Code length Cover
0 m - 10 m 100% 0%
10 m - 50 m 80% 20%
50 m - 90 m 70% 30%
90 m - 110 m 60% 40%
Shade
Normally, shade patterns on the staff do not affect the measurement results.
However, avoid dark shade, as it can have the same effect as an interfering
cover on the eld of view.
Focus
A slightly unfocused image does not inuence the measuring time and the
accuracy. When large focus errors occur, the instrument stops the measure-
ment. On LS15 instruments, the Autofocus routine is based on the maximum
contrast of code on the instruments sensor. If the reticle is not adjusted to
the eyesight of the user, this may lead to the impression of an incomplete
auto focussing. For details on how to adjust the reticle to the eyesight, refer
to 4.3 Instrument Setup.
Measuring through window panes
Avoid measuring through window panes.
Precision mode for line levelling
If a line levelling job requires high accuracy, activate the precision mode. Refer
to 7.4.3 Setting Tolerances.
Measurement Guidelines 33